(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[cp][ep][fp][hp][cq][dq][fq][fr][hr][fs]AB[en][bo][do][bp][dp][bq][eq][br][er][es]C[This is the problem position. Black to play.]
(;B[dr]C[If black plays here to try and connect the black stones...]
;W[cr]C[...then this is atari. Playing the black move
here first fails in the same way.])
(;B[ds]C[Here black also gets an atari in reply]
;W[cs])
(;B[cs]C[The diagonal move is the only one that connects.
This is the correct answer.]
;W[ds]C[If white plays the atari..]
;B[dr]C[...black captures...]
;W[cr]C[... and when white ataris again it is also self-atari]
;B[co]))